Breloom works great, it is quite rare that i play a game without him knocking something out, the classic technician set allows me to hit bulky pokemon, and using spore on slow pokemon i can get a boost to really sweep with mach punch. I feel quite safe with him when facing a sand team.

I take advantage of heatran and his immunities and natural defense, he still is a good attacker, chose lava plume over fire blast for the accuracy issue and over flamethrower because of the possibility of burn, hp ice for flying ground tipes (gliscor, landorus) and to stop the rampage of dragons, earth power to eliminate other heatrans and sunny day to bring in the light after knocking politoed.

Ive always had a dragonite on my ou team, with one dragon dance it turns into a beast only a few can wall, outrage is the main stab and causes lots of damage to anything that doesnt resist it, extremespeed as priority becomes in handy sometimes, fire punch is basically for steel and ice types however sometimes i feel id be better with earthquake.

This starmie set is used to outspeed the majority of the pokemon on the tier, I chose the moves to take full advantage of starmie attacking power basically, surf and psychic as main stabs, thunderbolt for water types and ice beam for grass and dragons.

The team looks great so far but i would suggest a focus sash for breloom in order for the set you chose to always work. Also Dnite breaks skarmory and ferrothorn walls but Earthquake allows for a lot more coverage.

You have a pretty solid hyper offensive team here but there are a few things in it that I'd like to point out. For starters your Heatran set would do better off with Solar Beam over HP Ice. Solar Beam is a quick and easy way to decimate the likes of Politoed and Tyranitar. You lose the ability to hit dragons but Mamoswine does that already. Another thing I notice is that your team is entry hazard weak,the main weakness being a Deoxys-D who can outspeed and Taunt most of the team and setup Steatlh Rocks and at least 1 layer of spikes. A Starmie set of Surf / Psyshock / Ice Beam / Rapid Spin should solve this,and also helps Dragonite maintain its Multiscale. For the final slot I suggest the Ebelt Latios,or a Scarf Trick variant as things like Scarf Landorus can sometimes prove fatal if they predict correctly. other than that the team looks pretty decent.